Add a pre-commit config to run with the specific defines of major pro…

…jects

Run with pre-commit run -a -c .pre-commit-config-defines.yaml

This is not enabled by default, because the code, which is rather
convoluted due to the inability to pass --define to dotnet format,
coupled with our files' containing BOMs, doesn't run on Windows. It
barely runs on Linux, tbh ;-)

.pre-commit-config-defines.yaml

@@ -0,0 +1,26 @@
+---
+repos:
+  - repo: local
+    hooks:
+      - id: dotnet-format-windows
+        name: dotnet-format for Windows
+        language: system
+        entry: ./pre-commit-dotnet-format-windows.sh
+        types_or: [c#, vb]
+        exclude: ^(Assets/ThirdParty)|(Packages/)|(Assets/Photon/)
+  - repo: local
+    hooks:
+      - id: dotnet-format-multiplayer
+        name: dotnet-format for multiplayer
+        language: system
+        entry: ./pre-commit-dotnet-format-multiplayer.sh
+        types_or: [c#, vb]
+        exclude: ^(Assets/ThirdParty)|(Packages/)|(Assets/Photon/)
+  - repo: local
+    hooks:
+      - id: dotnet-format-oculus
+        name: dotnet-format for oculus
+        language: system
+        entry: ./pre-commit-dotnet-format-oculus.sh
+        types_or: [c#, vb]
+        exclude: ^(Assets/ThirdParty)|(Packages/)|(Assets/Photon/)

pre-commit-dotnet-format-multiplayer.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+export DEFINES="UNITY_EDITOR UNITY_EDITOR_WIN UNITY_ANDROID TILT_BRUSH PHOTON_UNITY_NETWORKING,PUN_2_0_OR_NEWER,PUN_2_OR_NEWER,PUN_2_19_OR_NEWER,FUSION_WEAVER,FUSION2,CROSS_PLATFORM_INPUT,MOBILE_INPUT,PHOTON_VOICE_DEFINED"
+./pre_commit_dotnet_format.sh "$@"

pre-commit-dotnet-format-oculus.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+export DEFINES="UNITY_EDITOR UNITY_ANDROID TILT_BRUSH OCULUS_SUPPORTED FORCE_HEADTRACKING FORCE_FOCUSAWARE FORCE_QUEST_SUPPORT_DEVICE USE_TILT_BRUSH_CPP UNITY_2017_2_OR_NEWER UNITY_2018_4_OR_NEWER UNITY_2019_3_OR_NEWER UNITY_2020_3_OR_NEWER UNITY_5_4_OR_NEWER UNITY_5_6_OR_NEWER PASSTHROUGH_SUPPORTED"
+./pre_commit_dotnet_format.sh "$@"

pre-commit-dotnet-format-windows.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+export DEFINES="UNITY_EDITOR UNITY_EDITOR_WIN UNITY_WIN TILT_BRUSH SELECTION_ON AUDIO_REACTIVE USD_SUPPORTED FBX_SUPPORTED UNITY_STANDALONE_WIN USE_TILT_BRUSH_CPP UNITY_2017_2_OR_NEWER UNITY_2018_4_OR_NEWER UNITY_2019_3_OR_NEWER UNITY_2020_3_OR_NEWER UNITY_5_4_OR_NEWER UNITY_5_6_OR_NEWER PASSTHROUGH_SUPPORTED"
+./pre_commit_dotnet_format.sh "$@"

pre_commit_dotnet_format.sh

@@ -0,0 +1,95 @@
+#!/bin/bash
+set -e
+
+# Check if the DEFINES environment variable is set
+if [[ -z "$DEFINES" ]]; then
+  echo "Error: The DEFINES environment variable is not set."
+  exit 1
+fi
+
+# Convert the DEFINES environment variable into an array
+IFS=', ' read -r -a defines <<< "$DEFINES"
+
+# Temporary marker to identify added lines
+marker="### TEMP DEFINES ###"
+
+# Read the list of staged files from pre-commit
+staged_files=("$@")
+
+# Check if we are running on macOS or Linux
+if [[ "$(uname)" == "Darwin" ]]; then
+  SED_CMD="gsed"  # Use gsed on macOS
+else
+  SED_CMD="sed"   # Use sed on Linux
+fi
+
+# Process only staged files
+echo "Processing staged files..."
+for file in "${staged_files[@]}"; do
+  # Skip non-C# files
+  if [[ "$file" != *.cs ]]; then
+    continue
+  fi
+
+  # Check if the file has a BOM (EF BB BF at the start of the file) using xxd
+  bom_present=false
+  bom_hex=$(xxd -p -l 3 "$file")
+  if [[ "$bom_hex" == "efbbbf" ]]; then
+    bom_present=true
+  fi
+
+  # If BOM is present, remove it temporarily
+  if $bom_present; then
+    # Remove BOM bytes (first 3 bytes) using tail and save content to temporary file
+    tail -c +4 "$file" > "$file.tmp" && mv "$file.tmp" "$file"
+  fi
+
+  # Add defines only if marker is not already present
+  if ! grep -q "$marker" "$file"; then
+    # Add each define line separately using sed to insert at the top
+    for define in "${defines[@]}"; do
+      $SED_CMD -i "1i\\#define $define" "$file"
+    done
+    # Insert marker to identify where defines were added
+    $SED_CMD -i "1i\\$marker" "$file"
+  fi
+
+  # If BOM was present, reinsert it at the beginning of the file
+  if $bom_present; then
+    # Reinsert BOM at the start of the file
+    { echo -n -e '\xEF\xBB\xBF'; cat "$file"; } > "$file.tmp" && mv "$file.tmp" "$file"
+  fi
+done
+
+# Run dotnet format
+echo "Running dotnet format..."
+dotnet format whitespace --folder --include "$@"
+
+# Remove only the added defines
+echo "Removing temporary defines..."
+for file in "${staged_files[@]}"; do
+  # Skip non-C# files
+  if [[ "$file" != *.cs ]]; then
+    continue
+  fi
+
+  # Check if the file has a BOM (EF BB BF at the start of the file) using xxd
+  bom_present=false
+  bom_hex=$(xxd -p -l 3 "$file")
+  if [[ "$bom_hex" == "efbbbf" ]]; then
+    bom_present=true
+  fi
+
+  # Use a temporary file to preserve BOM while modifying
+  tmp_file="$file.tmp"
+  # Remove the marker and added defines, ensuring the BOM stays intact
+  $SED_CMD "/$marker/,+${#defines[@]}d" "$file" > "$tmp_file" && mv "$tmp_file" "$file"
+
+  # If BOM was present, reinsert it at the beginning of the file
+  if $bom_present; then
+    # Reinsert BOM at the start of the file
+    { echo -n -e '\xEF\xBB\xBF'; cat "$file"; } > "$file.tmp" && mv "$file.tmp" "$file"
+  fi
+done
+
+echo "Pre-commit hook completed!"